This starts to fix the scripts so that they load from /usr/lib/crosutils

cros_run_unit_tests

 #!/bin/bash
 
 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # This script builds and runs Chromium OS unit tests.  Note that this script
 # utilizes the src_test stanza in chromeos-base packages.  These stanzas
 # should both build and run the unit tests.
 
 # This script requires that you run build_packages first.
 
-. "$(dirname "$0")/common.sh"
+# --- BEGIN COMMON.SH BOILERPLATE ---
+# Load common CrOS utilities.  Inside the chroot this file is installed in
+# /usr/lib/crosutils.  Outside the chroot we find it relative to the script's
+# location.
+find_common_sh() {
+  local common_paths=(/usr/lib/crosutils $(dirname "$(readlink -f "$0")"))
+  local path
+
+  SCRIPT_ROOT=
+  for path in "${common_paths[@]}"; do
+    if [ -r "${path}/common.sh" ]; then
+      SCRIPT_ROOT=${path}
+      break
+    fi
+  done
+}
+
+find_common_sh
+. "${SCRIPT_ROOT}/common.sh" || (echo "Unable to load common.sh" && exit 1)
+# --- END COMMON.SH BOILERPLATE ---
 
 get_default_board
 
 # Flags
 DEFINE_string board "${DEFAULT_BOARD}" \
   "Target board of which tests were built"
 DEFINE_string build_root "${DEFAULT_BUILD_ROOT}" \
   "Root of build output"
 DEFINE_string package_file "" \
   "File with space-separated list of packages to run unit tests" f
@@ skipping 45 matching lines @@
 fi
 
 [ -n "${FLAGS_packages}" ] && PACKAGE_LIST="${PACKAGE_LIST} ${FLAGS_packages}"
 
 # If we didn't specify packages, find all packages.
 if [ -z "${FLAGS_package_file}" -a -z "${FLAGS_packages}" ]; then
   PACKAGE_LIST=$( ./get_package_list chromeos --board="${FLAGS_board}" |
                   egrep '^chromeos-base' )
 fi
 
-BLACK_LIST_FILE="$(dirname "$0")/unit_test_black_list.txt"
+BLACK_LIST_FILE="${SCRIPTS_DIR}/unit_test_black_list.txt"
 
 if [ "${FLAGS_withdebug}" -eq "${FLAGS_FALSE}" ]; then
   export USE="${USE} -cros-debug"
 fi
 
 for package in ${PACKAGE_LIST}; do
   if grep -xq "${package}" "${BLACK_LIST_FILE}"; then
     warn "Skipping package ${package} since it is blacklisted."
     continue
   fi
@@ skipping 14 matching lines @@
   warn "${NO_UNITTESTS}"
 fi
 
 if [ ${TEST_FAILURES} -ne 0 ]; then
   error "Run completed with ${TEST_FAILURES}/${TEST_COUNT} test failures."
   error "Following packages had failing tests:"
   die "${FAILED_PACKAGES}"
 else
   info "All unit tests passed."
 fi